I did the following today to make a backup of wd0 to sd0 on a Dell
PIII-500 today:

# dd if=/dev/rwd0d bs=1m | gyip -v9 >rwd0d

It ran for ~1 hour, than gave me:

wd0d:  aborted command reading fsbn 28228992 of 28228992-28229119 (wd0 bn
28228992; cn 28004 tn 14 sn 15) retrying
wd0: transfer error, downgrading to DMA mode 2
wdi(pciide0:0:0): using PIO mode 4, DMA mode 2 (using DMA data transfers)
wd0d:  aborted command reading fsbn 28228992 of 28228992-28229119 (wd0 bn
28228992; cn 28004 tn 15 sn 15), retrying
wd0: transfer error, downgrading to PIO mode 4
wd0(pciide0:0:0): using PIO mode 4
wd0d:  aborted command reading fsbn 28228992 of 28228992-28229119 (wd0 bn
28228992; cn 28004 tn 15 sn 15), retrying
wd0d:  aborted command reading fsbn 28228992 of 28228992-28229119 (wd0 bn
28228992; cn 28004 tn 15 sn 15), retrying
wd0d:  aborted command reading fsbn 28229040 of 28228992-28229119 (wd0 bn
28229040; cn 28005 tn 0 sn 0), retrying
wd0d:  aborted command reading fsbn 28229040 of 28228992-28229119 (wd0 bn
28229040; cn 28005 tn 0 sn 0), retrying
dd: /dev/rwd0d: Input/output error
13783+0 records in
13783+0 records out
14452523008 bytes transferred in 4380 secs (3299662 bytes/sec)
 64.8%

Given that ~13.7GB were read, I assume the end of the disk was hit.  Or
shoud I worry about this? The disk is recognized as:

pciide0 at pci dev 7 function 1: Intel 82371AB IDE controller (PIIX4)
pciide: bus-master DMA support present
pciide: primary channel wired to compatibility mode
pciide: primary channel interrupting at irq 14
pciide: secondary channel wired to compatibility mode
pciide: secondary channel interrupting at irq 15
...
wd0 at pciide0 channel 0 drive 0: <IBM-DTTA-371440>
wd0: drive supports 16-secror pio transfers, lba addressing
wd0: 13783MB, 16383 cyl, 16 head, 63 sec, 512 byges/sect x 28229040 sectors
wd0: 32-bits data port
wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 2
wd0(pciide0:0:0): using PIO mode 4, Ultra-DAM mode 2 (using DMA data transfers)
(order from grep /kern/msgbuf)

This is with an 1-2 days old 1.4_BETA.


 - Hubert

-- 
NetBSD - Better for your uptime than Viagra